According to his LinkedIn profile, McMullin is Chief Policy Director at the U.S. House of Representatives for the Republican Conference. He was an operations officer for the Central Intelligence Agency from 1999 to 2010. During that time, he also volunteered as a refugee resettlement officer for the United Nations High Commissioner for Refugees for under a year. He also worked at Goldman Sachs for three years, and earned an MBA from the University of Pennsylvania's Wharton School.

McMullin also appears to have a sense of humor. Prior to attending Brigham Young University for his bachelor's degree, he worked as a deckhand for a commercial fishing vessel. On LinkedIn, he wrote of his experience, "I mostly just did my best not to fall in as we sailed the Alaskan seas." He also served as a missionary in Brazil.

However, at least one significant experience McMullin appears to lack is leading an election campaign. Although he has an extensive resume in government services, McMullin has never held public office.